There is no change in the internal energy of the rocks because the rock are static and not moving to generate any potential energy.
What is Internal energy?
In thermodynamic system, an internal energy refers to the energy that is contained within a system or material.
All the material of the earth's interior moves constantly and consumes energy.
The earth possesses energy of several kinds which includes thermal energy, kinetic energy, and magnetic energy.
However, there is no change in the internal energy of the rocks because the rock are static and not moving to generate any potential energy.
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